Hamburg 2001 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 7: Poster I

HL 7.84: Poster

Montag, 26. März 2001, 10:30–19:00, Rang S\ 3

Study of Capacitance and Tunneling-Resistance in One-Dimensional Electron Systems — •J. Lohse, I. Pallecchi, Ch. Heyn, and W. Hansen — Institut für Angewandte Physik, Universität Hamburg, Jungiusstr. 11, 20355 Hamburg

We study the behaviour of one-dimensional electron systems by magnetocapacitance measurements. One-dimensional confinement is obtained in metal-insulator-semiconductor heterostructures by means of field effect. Fork-shaped interdigital metallic gates are realized by electron beam-lithography. Phase sensitive measurement of the sample impedance allows us to study the thermodynamic and tunneling density of states. We observe a drastically increased tunneling resistance at the onset of the first one-dimensional subband with in-plane field. The behaviour in parallel and perpendicular field, which so far is not well understood, will be discussed.